ML19261E453

Forwards List of Addl Info About Power Sys to Continue FSAR Review & Evaluation

ML19261E453
Person / Time
Site:	LaSalle
Issue date:	07/19/1979
From:	Parr O Office of Nuclear Reactor Regulation
To:	Brian Lee COMMONWEALTH EDISON CO.
References
NUDOCS 7908150177
Download: ML19261E453 (4)

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3, UNITED STATES I T e )f(

'e NUCLEAR REGULATORY COMMISSION i.kf"/..i WASHINGTON, D. C. 20555

&%/l T$l JUL 13 1979 OccKet Nos. 50-373 *,

and 50-374 Mr. Syrcn Lee, Jr.

Vice President Commonwealth Edison Comoany P. O. Box 767 Chicago, Illinois 50690

SUBJECT:

REQUEST FOR ADDITICNAL INFORMATION CONCERNING LA SALLE COUNTY STATION, UNITS 1 & 2 As a result of our continuing review of the La Salle Final Safety Analysis Report, we find we need additional information in the area of power syster.>

to continue our evaluation.

The specific information required is listed in the Enclosure.

Please inform us after receipt of this letter the date you can sup91.y :ne requested information.

Please contact us if you desire any discussions or clarification of :1e information requested.

Sincerely, IS b utan D. Darr, Cnief Light '.iater Reac:ces Branch 's.

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Division of Proje:c Manage:6 it

Enclosure:

As Stated cc w/ enclosure:

See next page

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.i y90815017 7 8

JUL 1] 1979 Mr. Byron Lee, J r. '

cc:

Richard E. Powell, Esq.

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Isham, Lincoln & Beale One First National Plaza 2400 Chicago, Illinois 60670 Dean Hansell, Esq.

Assistant Attorney General State of Illinois 138 West Randolph Street Suite 2315 Chicago, Illinois 60601 M-m 4

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ENCLOSURE 040.0 PCWER SYSTEMS BRANCH 040.111 It is not clear from the information provided in the FSAR that your design of diesel generator "0", which is shared between Units I cnd 2, is in confornance with Position 2 of Regulatory Guide 1.81.

Therefore, provide the following additional information:

(1) Provide a detailed description of the actuation logic for the shared diesel generator.

Specifically address a false or spurious accident signal in one unit occuring, followed by the accident signal in the other unit, assuming loss of offsite power.

(2) Describe how complete information regarding the status of the shared diesel generator is provided for each unit operator.

(3) Describe how the interaction between the two units' engineered safety feature electric circuits is limited such that any allowable ccmbi-nation of maintenance and test operations in the units will not preclude the capability to automatically sucply pcwer to minimum ESF Icad to either unit, assuming loss of offsite pcwe.

(4) Discuss how the coordination required between the unit operators in order to accomplish item (3) above is minimized; define any cnordi-nation required for meeting item (3) or for any cther reascn.

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, (5)

Identify each auxiliary system associated with and requirec for the operation of the shared diesel generator and describe how and when these systems are powered from Unit 1 and/or Unit 2.

040.117 In your discussion of Regulatory Guide 1.108 presented in Appendix "B" of the FSAR, you state that the demonstrat:on test program of position C.2.a will not be repeated every 18 months (3s required by the regulatory guide), nor do you give an alternative for a scheduler test program.

This is unacceptable.

In addition, you do not discuss positions C.1, C.2.d, C.2.e, and C.3 of this guice.

Please provide a conmitment to meet these positions as well as C.2.a or ;,rovide alternatives for our review.

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